splone: splitting parents properly.

* chain/src/item/default/splone.rs: Previouslt the function
  `split_node` used to split the parents of splitted nodes by an ugly
  logic.  Now that is moved into a dedicated function, which properly
  handles the splitting of parents, including the case when the new
  node is open whereas the old node is closed, in which situation we
  ought to put the new node under the opened node only, as a closed
  node cannot contain an open node as a child by definition.

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